Blue sulfur dye.



mean srar'ns Parana oriarou.

ALFRED THAUSS, 0F ELBERFELD, GERMANY, ASSIGNOR TO FARBENFABRIKEN VORM. FRIEDR. BAYER & 00., OF ELBERFELD, GERMANY, A CORPORATION OF GERMANY.

BLUE SULFUR DYE.

No Drawing.

To all whom it may concern:

Be it known that I, ALFRED THAUSS, doctor of philosophy, chemist, citizen of the German Empire, residing at Elberfeld, Germany, have invented new and useful Improvements in Blue Sulfur Dye, of which the following is a specification.

I have found that new and valuable sulfid i solubility and they produce pure blue shades fast to washing. Instead of the indophenols leueoindophenols can be used.

In order to illustrate the new process more fully the following example is given, the parts being by weight :--2 parts of the leueoindoplienol of the formula:

@onfies ofthia patent may be obtained ior flve cents each; eaiflre were a s" Specification of Letters Patent.

Application filed May 22, 1912.

Serial No. 698,941.

be directly dried or subjected to purifica-' tion. It dyes a blue.

'I claim 1. The herein described new sulfur dyes being sulfur containing derivatives of indophenols derived from a nitrosophenol and diaryl-amin-carboxylic acids which are after being dried and pulverized dark powders, soluble in a solution of sodium sulfid generally with a blue coloration, soluble in concentrated sulfuric acid generally with a blue to green coloration; and dyeing unmordanted cotton blue shades, substantially as described. I

2. The herein described new sulfur dye obtained from leucoindophenol of the-formula:

which is after being dried and pulverized a dark powder soluble in a sodium sulfid solu tion with a blue coloration and soluble in concentrated sulfuric acid With a greenish- Patented Dec. M5, 1913.

black coloration; dyeing unmordanted cotton in pure blue shades fast to washing-substantially aS-dQSCI'lbGCl.

In testimony whereof I have hereunto set my hand in-the presence of two subscribing Witnesses.

ALFRED THAUSS. [1 s.] Witnesses:

HELEN NUFER, ALBERT NUFER.

we the Goeeiener of ltatents 

